well, technically, the engine is the same engine that's been in toyota camry/avalon/rav4/highlander for many years (at least 3+) with some exceptions.

the manual says that you can use unleaded. I plan doing 2 tanks of unleaded and then 1 tank of premium just to keep it "clean"

not necessary, but it's the thought that counts

ElliotB

10-23-12 04:31 PM

"1 tank of premium just to keep it "clean" A quality regular grade fuel with detergent will do the job.

Jim2003

10-23-12 05:55 PM

86K on my wives 2007 ES350. We have run regular its whole life. When I do the oil change I put a bottle of Chevron Tettron in the tank. My wife gets 24 to 26 mpg in town. We get 29 to 31 on the highway with me driving. No reason to run premium gas.

Dave Mac

10-23-12 06:01 PM

I am most certainly not an engineer but I don't think premium unleaded is "cleaner" than regular unleaded gasoline.

I have often put premium in the tank looking for better performance but truly can not see either a performance or mileage difference.

I do occasionally put a can of Techron in the tank but again don't see any effect.

Dave Mac

simwilson

10-23-12 06:46 PM

gas for lexus es 300 h

Yes, the recommendation is regular gasoline only. I have read about the aktinson engine which is the engine used in this model as well as the toyota camry hybrid. With going into alot of technical detail. This engine was made to handle the lower octane fuel. i even read where some thought that e85 could also work. i would not attempt doe to this not being recommended by the manufacturer. i suggest reading about the atkinson engine. It's very informative.

MY100thcar

10-23-12 07:48 PM

Quote:

Originally Posted by simwilson
(Post 7560006)

Yes, the recommendation is regular gasoline only. I have read about the aktinson engine which is the engine used in this model as well as the toyota camry hybrid. With going into alot of technical detail. This engine was made to handle the lower octane fuel. i even read where some thought that e85 could also work. i would not attempt doe to this not being recommended by the manufacturer. i suggest reading about the atkinson engine. It's very informative.

I have not read about the aktinson engine but I would like to.
Can you post a link to the info.?
Thanks, Joe

flowrider

10-23-12 08:45 PM

Quote:

Originally Posted by Dave Mac
(Post 7559887)

I am most certainly not an engineer but I don't think premium unleaded is "cleaner" than regular unleaded gasoline.

Dave Mac

You are in fact correct. The detergent content is the same for all three grades.

Lou

xspsi6

10-23-12 08:55 PM

Premium fuel burns slower thus is actually a more dirty burn unless you have the proper cyl pressure to use the high octane fuel to it's full or close to it's upper potential so in actually it does the exact opposite as you may think.

In other words anything other than regular is a waste and may be harmful in the long run.

UncleBen

10-24-12 02:19 AM

Quote:

Originally Posted by xspsi6
(Post 7560309)

Premium fuel burns slower thus is actually a more dirty burn unless you have the proper cyl pressure to use the high octane fuel to it's full or close to it's upper potential so in actually it does the exact opposite as you may think.

In other words anything other than regular is a waste and may be harmful in the long run.

Wow! That's news to me. This thread and your post caused me to Google the subject and came across this article.

It's still shocking to me that the ES 350 does not require premium gas. My state's gas station sells 87, 89 and 92 what would you guys recommend I use? Would it hurt the car even if I put premium in there?